Have until now only 2 drill and our good knife sharpened and I found the grinder just fine. He has served its purpose for me in this respect. Through the two discs can be only somewhat coarse rough-and then reground fine. Only the many sparks that already fly extremely through the area, a bit annoying. Also, the two discs rotate together due to the fact that only an on / off switch is available, bring a small risk, so that one in his arms something should already be careful. I think for the price you should not expect all too much you, with my drills and knives I was quite happy with the result, however.
